If the evaporator coil on it ices up the thaws then ices up again your low on freon/refrigerant some use R-22 freon and some newer units use R-134a refrigerant,you can look and see if the condenser and evaporator coils need cleaning because if they get dirty and cant get rid of heat and it will build too much head pressure and the compressor will cycle off to protect it,but it sounds like a low refrigerant problem

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heater blows cold air idle chrysler 300 Questions & Answers ...

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Check the thermostat. It's almost like a "float" that allows coolant to pass through a hose. If it gets stuck, you have heating issues. Since yours seems to fluctuate, I'd bet it's a thermostat about to go. Fortunately, it's easy to fix and inexpensive.

SOUNDS LIKE YOU HAVE A SHORT IN THE WIRING BETWEEN THE FUSE AND THE AC PANEL, USE A CONTINUITY TESTER TO CHECK FOR CONTINUITY , IF THAT FAILS OR IS OK THEN CHECK ALL RELATED RELAYS IT MAY JUST BE THAT YOUR AC NEEDS RE GASSING?

Try flushing or blowing high pressure air through the heater core lines. its sludge build up and need to be flushed through heater core only. check antifreeze fluid level. only put in straight antifreeze, do not mix. most people do not know what mixture should be, so be safe and add straight, it will not hurt it, i run 100% straight antifreeze and never had a problem or worry about it ever freezing and cracking my block, heads or radiator cracking.

Either the unit is really dirty or it is low on refrigerant. A unit tha is low on refrigerant will start off cold and withing a few minutes, start warming up. If you aren't seeing any water its because of one or both causes listed.

With the car warmed up,feel the heater hoses,are they both warm/hot near the firewall in the engine compartment?If they are both warm/hot,then the heater core should have circulation through it and it may be a "blend door" issue in the heater a/c assembly.If they are not warm/hot then the heater core could be dirty and plugged up and needs to be flushed.
If the above does not help,a drain and vacuum of the cooling system and vacuum refill will remove any trapped air.
Sometimes,clamping off the top rad hose and holding the engine rpm at 2000 rpm will force trapped air out of the heater core.(Watch temp gauge when trying this)
Lastly,a NEW thermostat doesn't mean its working correctly.

You may have a problem with a temperature safety system. Before changing anything else, check to see if the unit is clean!!! Dirt/dust can fool the safety system into an overtemperature status. Inspect the heat coils for damage and dirt. Gently clean.